Top weekend show: Megadeth and Motorhead

gregkotMarina and the Diamonds declare "we"ll roast together." Sings with classical chops, dresses like a dominatrix in black vinyl. #lolla

Megadeth and Motorhead: For metal-heads, these two bands aren’t just icons from a bygone era. Their music has a certain age-less relevance. Megadeth’s Dave Mustaine and Motorhead’s Lemmy cling to their original visions with a pitbull tenacity, 6:30 p.m. Friday at the Aragon Ballroom, 1006 W. Lawrence Ave., $42.25; jamusa.com.